Ahriman

Ahriman, Arimanes, in the Zend-Avesta, the principle of evil, symbolised by darkness, and opposed to Ormuzd, the principle of good, symbolised by light. According to the Magians, both existed from eternity, though Zoroaster himself seems to have taught that only the latter was eternal and that the former was a created being. The Zend-Avesta says that this world will be for 12,000 years the scene of a fierce conflict between these principles, but that good will finally triumph over evil.